With just three days before the Florida primaries, Mitt Romney has unleashed a new attack ad against his chief rival, Newt Gingrich. Airing in the Sunshine State on Saturday, the spot features a 30-second clip from an old segment of the NBC Nightly News, the night Tom Brokaw announced the House vote to punish Gingrich for an ethics violation. Gingrich, who paid a $300,000 reimbursement fee for the penalty, has emphasized that the ethics inquiry was unfairly partisan. "Whether it was an unprecedented ethics reprimand, his erratic leadership style, or his resignation in disgrace at the hands of his own party, it is understandable why Speaker Gingrich would want to re-write history," Romney spokesman Ryan Williams said in a statement released with the ad.